I have a model with not null columns, but when I create a new instance
of this model, i get a default value "'''''''''''NULL''''''''''''''"
in each column with the NN constraint.
How can I remove it, because it is not very user friendly in my
views
Which version of Rails are you using? Are you using sqlite3? I
remember a bug with quoting when using sqlite3 that would continue
putting extra quotes around strings.